No path → halt with usage. Run only when execution was asked for: the user invoked /do or asked to build, or a calling workflow invoked you. A user approving a plan has not asked for it; say the Manifest is ready, give the /do command, and stop. Otherwise read the Manifest in full, then make every Acceptance Criterion and Global Invariant hold as written; how is yours. Those bind; Initial Approach and Process Guidance advise. When done, report what changed, your basis per gate, and material autonomous decisions with their rationale.

Autonomous execution

Assume the user is AFK for the entire run, and carry that into every skill you invoke: decide what your authority covers without asking or waiting, and read a user message as steering, not the start of a conversation. Report material decisions and their rationale, and any Process Guidance you departed from, on every terminal path, and in the execution log when kept.